package com.ly.hotel.httpserver;

import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.Closeable;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.io.PushbackInputStream;
import java.io.RandomAccessFile;
import java.io.UnsupportedEncodingException;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.ServerSocket;
import java.net.Socket;
import java.net.SocketException;
import java.net.SocketTimeoutException;
import java.net.URLDecoder;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Date;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.Set;
import java.util.StringTokenizer;
import java.util.TimeZone;

public abstract class NanoHTTPD {    
    /**  
     * Maximum time to wait on Socket.getInputStream().read() (in milliseconds)  
     * This is required as the Keep-Alive HTTP connections would otherwise  
     * block the socket reading thread forever (or as long the browser is open).  
     */    
    public static final int SOCKET_READ_TIMEOUT = 5000;    
    /**  
     * Common mime type for dynamic content: plain text  
     */    
    public static final String MIME_PLAINTEXT = "text/plain";    
    /**  
     * Common mime type for dynamic content: html  
     */    
    public static final String MIME_HTML = "text/html";    
    /**  
     * Pseudo-Parameter to use to store the actual query string in the parameters map for later re-processing.  
     */    
    private static final String QUERY_STRING_PARAMETER = "NanoHttpd.QUERY_STRING";    
    private final String hostname;    
    private final int myPort;    
    private ServerSocket myServerSocket;    
    private Set<Socket> openConnections = new HashSet<Socket>();    
    private Thread myThread;    
    /**  
     * Pluggable strategy for asynchronously executing requests.  
     */    
    private AsyncRunner asyncRunner;    
    /**  
     * Pluggable strategy for creating and cleaning up temporary files.  
     */    
    private TempFileManagerFactory tempFileManagerFactory;    
    
    /**  
     * Constructs an HTTP server on given port.  
     */    
    public NanoHTTPD(int port) {    
        this(null, port);    
    }    
    
    /**  
     * Constructs an HTTP server on given hostname and port.  
     */    
    public NanoHTTPD(String hostname, int port) {    
        this.hostname = hostname;    
        this.myPort = port;    
        setTempFileManagerFactory(new DefaultTempFileManagerFactory());    
        setAsyncRunner(new DefaultAsyncRunner());    
    }    
    
    private static final void safeClose(Closeable closeable) {    
        if (closeable != null) {    
            try {    
                closeable.close();    
            } catch (IOException e) {    
            }    
        }    
    }    
    
    private static final void safeClose(Socket closeable) {    
        if (closeable != null) {    
            try {    
                closeable.close();    
            } catch (IOException e) {    
            }    
        }    
    }    
    
    private static final void safeClose(ServerSocket closeable) {    
        if (closeable != null) {    
            try {    
                closeable.close();    
            } catch (IOException e) {    
            }    
        }    
    }    
    
    /**  
     * Start the server.  
     *  
     * @throws IOException if the socket is in use.  
     */    
    public void start() throws IOException {    
        myServerSocket = new ServerSocket();    
        myServerSocket.bind((hostname != null) ? new InetSocketAddress(hostname, myPort) : new InetSocketAddress(myPort));    
    
        myThread = new Thread(new Runnable() {    
            @Override    
            public void run() {    
                do {    
                    try {    
                        final Socket finalAccept = myServerSocket.accept();    
                        registerConnection(finalAccept);    
                        finalAccept.setSoTimeout(SOCKET_READ_TIMEOUT);    
                        final InputStream inputStream = finalAccept.getInputStream();    
                        asyncRunner.exec(new Runnable() {    
                            @Override    
                            public void run() {    
                                OutputStream outputStream = null;    
                                try {    
                                    outputStream = finalAccept.getOutputStream();    
                                    TempFileManager tempFileManager = tempFileManagerFactory.create();    
                                    HTTPSession session = new HTTPSession(tempFileManager, inputStream, outputStream, finalAccept.getInetAddress());    
                                    while (!finalAccept.isClosed()) {    
                                        session.execute();    
                                    }    
                                } catch (Exception e) {    
                                    // When the socket is closed by the client, we throw our own SocketException    
                                    // to break the  "keep alive" loop above.    
                                    if (!(e instanceof SocketException && "NanoHttpd Shutdown".equals(e.getMessage()))) {    
                                        e.printStackTrace();    
                                    }    
                                } finally {    
                                    safeClose(outputStream);    
                                    safeClose(inputStream);    
                                    safeClose(finalAccept);    
                                    unRegisterConnection(finalAccept);    
                                }    
                            }    
                        });    
                    } catch (IOException e) {    
                    }    
                } while (!myServerSocket.isClosed());    
            }    
        });    
        myThread.setDaemon(true);    
        myThread.setName("NanoHttpd Main Listener");    
        myThread.start();    
    }    
    
    /**  
     * Stop the server.  
     */    
    public void stop() {    
        try {    
            safeClose(myServerSocket);    
            closeAllConnections();    
            myThread.join();    
        } catch (Exception e) {    
            e.printStackTrace();    
        }    
    }    
    
    /**  
     * Registers that a new connection has been set up.  
     *  
     * @param socket  
     *            the {@link Socket} for the connection.  
     */    
    public synchronized void registerConnection(Socket socket) {    
        openConnections.add(socket);    
    }    
    
    /**  
     * Registers that a connection has been closed  
     *  
     * @param socket  
     *            the {@link Socket} for the connection.  
     */    
    public synchronized void unRegisterConnection(Socket socket) {    
        openConnections.remove(socket);    
    }    
    
    /**  
     * Forcibly closes all connections that are open.  
     */    
    public synchronized void closeAllConnections() {    
        for (Socket socket : openConnections) {    
            safeClose(socket);    
        }    
    }    
    
    public final int getListeningPort() {    
        return myServerSocket == null ? -1 : myServerSocket.getLocalPort();    
    }    
    
    public final boolean wasStarted() {    
        return myServerSocket != null && myThread != null;    
    }    
    
    public final boolean isAlive() {    
        return wasStarted() && !myServerSocket.isClosed() && myThread.isAlive();    
    }    
    
    /**  
     * Override this to customize the server.  
     * <p/>  
     * <p/>  
     * (By default, this delegates to serveFile() and allows directory listing.)  
     *  
     * @param uri     Percent-decoded URI without parameters, for example "/index.cgi"  
     * @param method  "GET", "POST" etc.  
     * @param parms   Parsed, percent decoded parameters from URI and, in case of POST, data.  
     * @param headers Header entries, percent decoded  
     * @return HTTP response, see class Response for details  
     */    
    @Deprecated    
    public Response serve(String uri, Method method, Map<String, String> headers, Map<String, String> parms,    
                                   Map<String, String> files) {    
        return new Response(Response.Status.NOT_FOUND, MIME_PLAINTEXT, "Not Found");    
    }    
    
    /**  
     * Override this to customize the server.  
     * <p/>  
     * <p/>  
     * (By default, this delegates to serveFile() and allows directory listing.)  
     *  
     * @param session The HTTP session  
     * @return HTTP response, see class Response for details  
     * 我们需要自己实现这个方法  
     */    
    public Response serve(IHTTPSession session) {    
        Map<String, String> files = new HashMap<String, String>();    
        Method method = session.getMethod();    
        if (Method.PUT.equals(method) || Method.POST.equals(method)) {    
            try {    
                session.parseBody(files);    
            } catch (IOException ioe) {    
                return new Response(Response.Status.INTERNAL_ERROR, MIME_PLAINTEXT, "SERVER INTERNAL ERROR: IOException: " + ioe.getMessage());    
            } catch (ResponseException re) {    
                return new Response(re.getStatus(), MIME_PLAINTEXT, re.getMessage());    
            }    
        }    
    
        Map<String, String> parms = session.getParms();    
        parms.put(QUERY_STRING_PARAMETER, session.getQueryParameterString());    
        return serve(session.getUri(), method, session.getHeaders(), parms, files);    
    }    
    
    /**  
     * Decode percent encoded <code>String</code> values.  
     *  
     * @param str the percent encoded <code>String</code>  
     * @return expanded form of the input, for example "foo%20bar" becomes "foo bar"  
     */    
    protected String decodePercent(String str) {    
        String decoded = null;    
        try {    
            decoded = URLDecoder.decode(str, "UTF8");    
        } catch (UnsupportedEncodingException ignored) {    
        }    
        return decoded;    
    }    
    
    /**  
     * Decode parameters from a URL, handing the case where a single parameter name might have been  
     * supplied several times, by return lists of values.  In general these lists will contain a single  
     * element.  
     *  
     * @param parms original <b>NanoHttpd</b> parameters values, as passed to the <code>serve()</code> method.  
     * @return a map of <code>String</code> (parameter name) to <code>List<String></code> (a list of the values supplied).  
     */    
    protected Map<String, List<String>> decodeParameters(Map<String, String> parms) {    
        return this.decodeParameters(parms.get(QUERY_STRING_PARAMETER));    
    }    
    
    /**  
     * Decode parameters from a URL, handing the case where a single parameter name might have been  
     * supplied several times, by return lists of values.  In general these lists will contain a single  
     * element.  
     *  
     * @param queryString a query string pulled from the URL.  
     * @return a map of <code>String</code> (parameter name) to <code>List<String></code> (a list of the values supplied).  
     */    
    protected Map<String, List<String>> decodeParameters(String queryString) {    
        Map<String, List<String>> parms = new HashMap<String, List<String>>();    
        if (queryString != null) {    
            StringTokenizer st = new StringTokenizer(queryString, "&");    
            while (st.hasMoreTokens()) {    
                String e = st.nextToken();    
                int sep = e.indexOf('=');    
                String propertyName = (sep >= 0) ? decodePercent(e.substring(0, sep)).trim() : decodePercent(e).trim();    
                if (!parms.containsKey(propertyName)) {    
                    parms.put(propertyName, new ArrayList<String>());    
                }    
                String propertyValue = (sep >= 0) ? decodePercent(e.substring(sep + 1)) : null;    
                if (propertyValue != null) {    
                    parms.get(propertyName).add(propertyValue);    
                }    
            }    
        }    
        return parms;    
    }    
    
    // ------------------------------------------------------------------------------- //    
    //    
    // Threading Strategy.    
    //    
    // ------------------------------------------------------------------------------- //    
    
    /**  
     * Pluggable strategy for asynchronously executing requests.  
     *  
     * @param asyncRunner new strategy for handling threads.  
     */    
    public void setAsyncRunner(AsyncRunner asyncRunner) {    
        this.asyncRunner = asyncRunner;    
    }    
    
    // ------------------------------------------------------------------------------- //    
    //    
    // Temp file handling strategy.    
    //    
    // ------------------------------------------------------------------------------- //    
    
    /**  
     * Pluggable strategy for creating and cleaning up temporary files.  
     *  
     * @param tempFileManagerFactory new strategy for handling temp files.  
     */    
    public void setTempFileManagerFactory(TempFileManagerFactory tempFileManagerFactory) {    
        this.tempFileManagerFactory = tempFileManagerFactory;    
    }    
    
    /**  
     * HTTP Request methods, with the ability to decode a <code>String</code> back to its enum value.  
     */    
    public enum Method {    
        GET, PUT, POST, DELETE, HEAD, OPTIONS;    
    
        static Method lookup(String method) {    
            for (Method m : Method.values()) {    
                if (m.toString().equalsIgnoreCase(method)) {    
                    return m;    
                }    
            }    
            return null;    
        }    
    }    
    
    /**  
     * Pluggable strategy for asynchronously executing requests.  
     */    
    public interface AsyncRunner {    
        void exec(Runnable code);    
    }    
    
    /**  
     * Factory to create temp file managers.  
     */    
    public interface TempFileManagerFactory {    
        TempFileManager create();    
    }    
    
    // ------------------------------------------------------------------------------- //    
    
    /**  
     * Temp file manager.  
     * <p/>  
     * <p>Temp file managers are created 1-to-1 with incoming requests, to create and cleanup  
     * temporary files created as a result of handling the request.</p>  
     */    
    public interface TempFileManager {    
        TempFile createTempFile() throws Exception;    
    
        void clear();    
    }    
    
    /**  
     * A temp file.  
     * <p/>  
     * <p>Temp files are responsible for managing the actual temporary storage and cleaning  
     * themselves up when no longer needed.</p>  
     */    
    public interface TempFile {    
        OutputStream open() throws Exception;    
    
        void delete() throws Exception;    
    
        String getName();    
    }    
    
    /**  
     * Default threading strategy for NanoHttpd.  
     * <p/>  
     * <p>By default, the server spawns a new Thread for every incoming request.  These are set  
     * to <i>daemon</i> status, and named according to the request number.  The name is  
     * useful when profiling the application.</p>  
     */    
    public static class DefaultAsyncRunner implements AsyncRunner {    
        private long requestCount;    
    
        @Override    
        public void exec(Runnable code) {    
            ++requestCount;    
            Thread t = new Thread(code);    
            t.setDaemon(true);    
            t.setName("NanoHttpd Request Processor (#" + requestCount + ")");    
            t.start();    
        }    
    }    
    
    /**  
     * Default strategy for creating and cleaning up temporary files.  
     * <p/>  
     * <p></p>This class stores its files in the standard location (that is,  
     * wherever <code>java.io.tmpdir</code> points to).  Files are added  
     * to an internal list, and deleted when no longer needed (that is,  
     * when <code>clear()</code> is invoked at the end of processing a  
     * request).</p>  
     */    
    public static class DefaultTempFileManager implements TempFileManager {    
        private final String tmpdir;    
        private final List<TempFile> tempFiles;    
    
        public DefaultTempFileManager() {    
            tmpdir = System.getProperty("java.io.tmpdir");    
            tempFiles = new ArrayList<TempFile>();    
        }    
    
        @Override    
        public TempFile createTempFile() throws Exception {    
            DefaultTempFile tempFile = new DefaultTempFile(tmpdir);    
            tempFiles.add(tempFile);    
            return tempFile;    
        }    
    
        @Override    
        public void clear() {    
            for (TempFile file : tempFiles) {    
                try {    
                    file.delete();    
                } catch (Exception ignored) {    
                }    
            }    
            tempFiles.clear();    
        }    
    }    
    
    /**  
     * Default strategy for creating and cleaning up temporary files.  
     * <p/>  
     * <p></p></[>By default, files are created by <code>File.createTempFile()</code> in  
     * the directory specified.</p>  
     */    
    public static class DefaultTempFile implements TempFile {    
        private File file;    
        private OutputStream fstream;    
    
        public DefaultTempFile(String tempdir) throws IOException {    
            file = File.createTempFile("NanoHTTPD-", "", new File(tempdir));    
            fstream = new FileOutputStream(file);    
        }    
    
        @Override    
        public OutputStream open() throws Exception {    
            return fstream;    
        }    
    
        @Override    
        public void delete() throws Exception {    
            safeClose(fstream);    
            file.delete();    
        }    
    
        @Override    
        public String getName() {    
            return file.getAbsolutePath();    
        }    
    }    
    
    /**  
     * HTTP response. Return one of these from serve().  
     */    
    public static class Response {    
        /**  
         * HTTP status code after processing, e.g. "200 OK", HTTP_OK  
         */    
        private Status status;    
        /**  
         * MIME type of content, e.g. "text/html"  
         */    
        private String mimeType;    
        /**  
         * Data of the response, may be null.  
         */    
        private InputStream data;    
        /**  
         * Headers for the HTTP response. Use addHeader() to add lines.  
         */    
        private Map<String, String> header = new HashMap<String, String>();    
        /**  
         * The request method that spawned this response.  
         */    
        private Method requestMethod;    
        /**  
         * Use chunkedTransfer  
         */    
        private boolean chunkedTransfer;    
    
        /**  
         * Default constructor: response = HTTP_OK, mime = MIME_HTML and your supplied message  
         */    
        public Response(String msg) {    
            this(Status.OK, MIME_HTML, msg);    
        }    
    
        /**  
         * Basic constructor.  
         */    
        public Response(Status status, String mimeType, InputStream data) {    
            this.status = status;    
            this.mimeType = mimeType;    
            this.data = data;    
        }    
    
        /**  
         * Convenience method that makes an InputStream out of given text.  
         */    
        public Response(Status status, String mimeType, String txt) {    
            this.status = status;    
            this.mimeType = mimeType;    
            try {    
                this.data = txt != null ? new ByteArrayInputStream(txt.getBytes("GBK")) : null;    
            } catch (UnsupportedEncodingException uee) {
                uee.printStackTrace();    
            }    
        }    
    
        /**  
         * Adds given line to the header.  
         */    
        public void addHeader(String name, String value) {    
            header.put(name, value);    
        }    
    
        /**  
         * Sends given response to the socket.  
         */    
        private void send(OutputStream outputStream) {    
            String mime = mimeType;    
            SimpleDateFormat gmtFrmt = new SimpleDateFormat("E, d MMM yyyy HH:mm:ss 'GMT'", Locale.US);    
            gmtFrmt.setTimeZone(TimeZone.getTimeZone("GMT"));    
    
            try {    
                if (status == null) {    
                    throw new Error("sendResponse(): Status can't be null.");    
                }    
                PrintWriter pw = new PrintWriter(outputStream);    
                pw.print("HTTP/1.1 " + status.getDescription() + " \r\n");    
    
                if (mime != null) {    
                    pw.print("Content-Type: " + mime + "\r\n");    
                }    
    
                if (header == null || header.get("Date") == null) {    
                    pw.print("Date: " + gmtFrmt.format(new Date()) + "\r\n");    
                }    
    
                if (header != null) {    
                    for (String key : header.keySet()) {    
                        String value = header.get(key);    
                        pw.print(key + ": " + value + "\r\n");    
                    }    
                }    
    
                pw.print("Connection: keep-alive\r\n");    
    
                if (requestMethod != Method.HEAD && chunkedTransfer) {    
                    sendAsChunked(outputStream, pw);    
                } else {    
                    sendAsFixedLength(outputStream, pw);    
                }    
                outputStream.flush();    
                safeClose(data);    
            } catch (IOException ioe) {    
                // Couldn't write? No can do.    
            }    
        }    
    
        private void sendAsChunked(OutputStream outputStream, PrintWriter pw) throws IOException {    
            pw.print("Transfer-Encoding: chunked\r\n");    
            pw.print("\r\n");    
            pw.flush();    
            int BUFFER_SIZE = 16 * 1024;    
            byte[] CRLF = "\r\n".getBytes();    
            byte[] buff = new byte[BUFFER_SIZE];    
            int read;    
            while ((read = data.read(buff)) > 0) {    
                outputStream.write(String.format("%x\r\n", read).getBytes());    
                outputStream.write(buff, 0, read);    
                outputStream.write(CRLF);    
            }    
            outputStream.write(String.format("0\r\n\r\n").getBytes());    
        }    
    
        private void sendAsFixedLength(OutputStream outputStream, PrintWriter pw) throws IOException {    
            int pending = data != null ? data.available() : 0; // This is to support partial sends, see serveFile()    
            pw.print("Content-Length: "+pending+"\r\n");    
    
            pw.print("\r\n");    
            pw.flush();    
    
            if (requestMethod != Method.HEAD && data != null) {    
                int BUFFER_SIZE = 16 * 1024;    
                byte[] buff = new byte[BUFFER_SIZE];    
                while (pending > 0) {    
                    int read = data.read(buff, 0, ((pending > BUFFER_SIZE) ? BUFFER_SIZE : pending));    
                    if (read <= 0) {    
                        break;    
                    }    
                    outputStream.write(buff, 0, read);    
    
                    pending -= read;    
                }    
            }    
        }    
    
        public Status getStatus() {    
            return status;    
        }    
    
        public void setStatus(Status status) {    
            this.status = status;    
        }    
    
        public String getMimeType() {    
            return mimeType;    
        }    
    
        public void setMimeType(String mimeType) {    
            this.mimeType = mimeType;    
        }    
    
        public InputStream getData() {    
            return data;    
        }    
    
        public void setData(InputStream data) {    
            this.data = data;    
        }    
    
        public Method getRequestMethod() {    
            return requestMethod;    
        }    
    
        public void setRequestMethod(Method requestMethod) {    
            this.requestMethod = requestMethod;    
        }    
    
        public void setChunkedTransfer(boolean chunkedTransfer) {    
            this.chunkedTransfer = chunkedTransfer;    
        }    
    
        /**  
         * Some HTTP response status codes  
         */    
        public enum Status {    
            OK(200, "OK"), CREATED(201, "Created"), ACCEPTED(202, "Accepted"), NO_CONTENT(204, "No Content"), PARTIAL_CONTENT(206, "Partial Content"), REDIRECT(301,    
                "Moved Permanently"), NOT_MODIFIED(304, "Not Modified"), BAD_REQUEST(400, "Bad Request"), UNAUTHORIZED(401,    
                "Unauthorized"), FORBIDDEN(403, "Forbidden"), NOT_FOUND(404, "Not Found"), METHOD_NOT_ALLOWED(405, "Method Not Allowed"), RANGE_NOT_SATISFIABLE(416,    
                "Requested Range Not Satisfiable"), INTERNAL_ERROR(500, "Internal Server Error");    
            private final int requestStatus;    
            private final String description;    
    
            Status(int requestStatus, String description) {    
                this.requestStatus = requestStatus;    
                this.description = description;    
            }    
    
            public int getRequestStatus() {    
                return this.requestStatus;    
            }    
    
            public String getDescription() {    
                return "" + this.requestStatus + " " + description;    
            }    
        }    
    }    
    
    public static final class ResponseException extends Exception {    
    
        private final Response.Status status;    
    
        public ResponseException(Response.Status status, String message) {    
            super(message);    
            this.status = status;    
        }    
    
        public ResponseException(Response.Status status, String message, Exception e) {    
            super(message, e);    
            this.status = status;    
        }    
    
        public Response.Status getStatus() {    
            return status;    
        }    
    }    
    
    /**  
     * Default strategy for creating and cleaning up temporary files.  
     */    
    private class DefaultTempFileManagerFactory implements TempFileManagerFactory {    
        @Override    
        public TempFileManager create() {    
            return new DefaultTempFileManager();    
        }    
    }    
    
    /**  
     * Handles one session, i.e. parses the HTTP request and returns the response.  
     */    
    public interface IHTTPSession {    
        void execute() throws IOException;    
    
        Map<String, String> getParms();    
    
        Map<String, String> getHeaders();    
    
        /**  
         * @return the path part of the URL.  
         */    
        String getUri();    
    
        String getQueryParameterString();    
    
        Method getMethod();    
    
        InputStream getInputStream();    
    
        CookieHandler getCookies();    
    
        /**  
         * Adds the files in the request body to the files map.  
         * @arg files - map to modify  
         */    
        void parseBody(Map<String, String> files) throws IOException, ResponseException;    
    }    
    
    protected class HTTPSession implements IHTTPSession {    
        public static final int BUFSIZE = 8192;    
        private final TempFileManager tempFileManager;    
        private final OutputStream outputStream;    
        private PushbackInputStream inputStream;    
        private int splitbyte;    
        private int rlen;    
        private String uri;    
        private Method method;    
        private Map<String, String> parms;    
        private Map<String, String> headers;    
        private CookieHandler cookies;    
        private String queryParameterString;    
    
        public HTTPSession(TempFileManager tempFileManager, InputStream inputStream, OutputStream outputStream) {    
            this.tempFileManager = tempFileManager;    
            this.inputStream = new PushbackInputStream(inputStream, BUFSIZE);    
            this.outputStream = outputStream;    
        }    
    
        public HTTPSession(TempFileManager tempFileManager, InputStream inputStream, OutputStream outputStream, InetAddress inetAddress) {    
            this.tempFileManager = tempFileManager;    
            this.inputStream = new PushbackInputStream(inputStream, BUFSIZE);    
            this.outputStream = outputStream;    
            String remoteIp = inetAddress.isLoopbackAddress() || inetAddress.isAnyLocalAddress() ? "127.0.0.1" : inetAddress.getHostAddress().toString();    
            headers = new HashMap<String, String>();    
    
            headers.put("remote-addr", remoteIp);    
            headers.put("http-client-ip", remoteIp);    
        }    
    
        @Override    
        public void execute() throws IOException {    
            try {    
                /* Read the first 8192 bytes.  
                   The full header should fit in here.  
                   Apache's default header limit is 8KB.  
                   Do NOT assume that a single read will get the entire header at once!  
                   header的最大长度为8192bytes，所以这里设置BUFSIZE为8192bytes  
                */    
                byte[] buf = new byte[BUFSIZE];    
                splitbyte = 0;    
                rlen = 0;//总共的长度    
                {    
                    int read = -1;//每次读取的长度    
                    try {    
                        read = inputStream.read(buf, 0, BUFSIZE);    
                    } catch (Exception e) {    
                        safeClose(inputStream);    
                        safeClose(outputStream);    
                        throw new SocketException("NanoHttpd Shutdown");    
                    }    
                    if (read == -1) {    
                        // socket was been closed    
                        safeClose(inputStream);    
                        safeClose(outputStream);    
                        throw new SocketException("NanoHttpd Shutdown");    
                    }    
                    while (read > 0) {    
                        rlen += read;    
                        splitbyte = findHeaderEnd(buf, rlen);    
                        if (splitbyte > 0)//如果返回0则说明没有找到    
                            break;    
                        read = inputStream.read(buf, rlen, BUFSIZE - rlen);    
                    }    
                }    
                //如果读多了，则将多余的部分重新写到流里面    
                if (splitbyte < rlen) {    
                    inputStream.unread(buf, splitbyte, rlen - splitbyte);    
                }    
    
                parms = new HashMap<String, String>();    
                if(null == headers) {    
                    headers = new HashMap<String, String>();    
                }    
    
                // Create a BufferedReader for parsing the header.    
                BufferedReader hin = new BufferedReader(new InputStreamReader(new ByteArrayInputStream(buf, 0, rlen)));    
    
                // Decode the header into parms and header java properties    
                Map<String, String> pre = new HashMap<String, String>();    
                decodeHeader(hin, pre, parms, headers);    
                /**  
                 * 取出客户端请求的方式：GET/POST  
                 */    
                method = Method.lookup(pre.get("method"));    
                if (method == null) {    
                    throw new ResponseException(Response.Status.BAD_REQUEST, "BAD REQUEST: Syntax error.");    
                }    
                //请求的连接    
                uri = pre.get("uri");    
    
                cookies = new CookieHandler(headers);    
    
                /*  
                 *  Ok, now do the serve()  
                 *  解析  
                 */    
                Response r = serve(this);    
                if (r == null) {    
                    throw new ResponseException(Response.Status.INTERNAL_ERROR, "SERVER INTERNAL ERROR: Serve() returned a null response.");    
                } else {    
                    cookies.unloadQueue(r);    
                    //响应客户端信息    
                    r.setRequestMethod(method);    
                    r.send(outputStream);    
                }    
            } catch (SocketException e) {    
                // throw it out to close socket object (finalAccept)    
                throw e;    
            } catch (SocketTimeoutException ste) {    
                throw ste;    
            } catch (IOException ioe) {    
                Response r = new Response(Response.Status.INTERNAL_ERROR, MIME_PLAINTEXT, "SERVER INTERNAL ERROR: IOException: " + ioe.getMessage());    
                r.send(outputStream);    
                safeClose(outputStream);    
            } catch (ResponseException re) {    
                Response r = new Response(re.getStatus(), MIME_PLAINTEXT, re.getMessage());    
                r.send(outputStream);    
                safeClose(outputStream);    
            } finally {    
                tempFileManager.clear();    
            }    
        }    
    
        @Override    
        public void parseBody(Map<String, String> files) throws IOException, ResponseException {    
            RandomAccessFile randomAccessFile = null;    
            BufferedReader in = null;    
            try {    
                //创建临时文件    
                randomAccessFile = getTmpBucket();    
    
                long size;    
                if (headers.containsKey("content-length")) {    
                    size = Integer.parseInt(headers.get("content-length"));    
                } else if (splitbyte < rlen) {    
                    size = rlen - splitbyte;    
                } else {    
                    size = 0;    
                }    
    
                /*  
                 *  Now read all the body and write it to f  
                 *  将流的内容写到临时文件中  
                 */    
                byte[] buf = new byte[512];    
                while (rlen >= 0 && size > 0) {    
                    rlen = inputStream.read(buf, 0, (int)Math.min(size, 512));    
                    size -= rlen;    
                    if (rlen > 0) {    
                        randomAccessFile.write(buf, 0, rlen);    
                    }    
                }    
    
                // Get the raw body as a byte []    
                ByteBuffer fbuf = randomAccessFile.getChannel().map(FileChannel.MapMode.READ_ONLY, 0, randomAccessFile.length());    
                randomAccessFile.seek(0);//重新定位到临时文件的开始位置    
    
                // Create a BufferedReader for easily reading it as string.    
                InputStream bin = new FileInputStream(randomAccessFile.getFD());    
                in = new BufferedReader(new InputStreamReader(bin));    
    
                // If the method is POST, there may be parameters    
                // in data section, too, read it:    
                if (Method.POST.equals(method)) {    
                    String contentType = "";    
                    String contentTypeHeader = headers.get("content-type");    
    
                    StringTokenizer st = null;    
                    if (contentTypeHeader != null) {    
                        st = new StringTokenizer(contentTypeHeader, ",; ");    
                        if (st.hasMoreTokens()) {    
                            contentType = st.nextToken();    
                        }    
                    }    
                    //表单提交，文件上传类型    
                    if ("multipart/form-data".equalsIgnoreCase(contentType)) {    
                        // Handle multipart/form-data    
                        if (!st.hasMoreTokens()) {    
                            throw new ResponseException(Response.Status.BAD_REQUEST, "BAD REQUEST: Content type is multipart/form-data but boundary missing. Usage: GET /example/file.html");    
                        }    
    
                        String boundaryStartString = "boundary=";    
                        int boundaryContentStart = contentTypeHeader.indexOf(boundaryStartString) + boundaryStartString.length();    
                        String boundary = contentTypeHeader.substring(boundaryContentStart, contentTypeHeader.length());    
                        if (boundary.startsWith("\"") && boundary.endsWith("\"")) {    
                            boundary = boundary.substring(1, boundary.length() - 1);    
                        }    
                        //fbuf里面包含body的内容    
                        decodeMultipartData(boundary, fbuf, in, parms, files);    
                    } else {    
                        // Handle application/x-www-form-urlencoded    
                        String postLine = "";    
                        StringBuilder postLineBuffer = new StringBuilder();    
                        char pbuf[] = new char[512];    
                        int read = in.read(pbuf);    
                        while (read >= 0 && !postLine.endsWith("\r\n")) {    
                            postLine = String.valueOf(pbuf, 0, read);    
                            postLineBuffer.append(postLine);    
                            read = in.read(pbuf);    
                        }    
                        postLine = postLineBuffer.toString().trim();    
                        decodeParms(postLine, parms);    
                    }    
                } else if (Method.PUT.equals(method)) {    
                    String content = saveTmpFile(fbuf, 0, fbuf.limit());    
                    files.put("content", content);    
                }    
            } finally {    
                safeClose(randomAccessFile);    
                safeClose(in);    
            }    
        }    
    
        /**  
         * Decodes the sent headers and loads the data into Key/value pairs  
         */    
        private void decodeHeader(BufferedReader in, Map<String, String> pre, Map<String, String> parms, Map<String, String> headers)    
            throws ResponseException {    
            try {    
                // Read the request line GET / HTTP/1.1    
                String inLine = in.readLine();    
                if (inLine == null) {    
                    return;    
                }    
                //分隔inLine用 \t\n\r\f    
                StringTokenizer st = new StringTokenizer(inLine);    
                if (!st.hasMoreTokens()) {    
                    throw new ResponseException(Response.Status.BAD_REQUEST, "BAD REQUEST: Syntax error. Usage: GET /example/file.html");    
                }    
                String method = st.nextToken();    
                pre.put("method", method);    
                if (!st.hasMoreTokens()) {    
                    throw new ResponseException(Response.Status.BAD_REQUEST, "BAD REQUEST: Missing URI. Usage: GET /example/file.html");    
                }    
    
                String uri = st.nextToken();    
                /*  
                 *  Decode parameters from the URI  
                 *  以"?" 来判断是否有参数  
                 */    
                int qmi = uri.indexOf('?');    
                if (qmi >= 0) {//说明有参数，调用decodeParms将参数解析到parms中    
                    decodeParms(uri.substring(qmi + 1), parms);    
                    uri = decodePercent(uri.substring(0, qmi));    
                } else {    
                    uri = decodePercent(uri);    
                }    
                // If there's another token, it's protocol version,    
                // followed by HTTP headers. Ignore version but parse headers.    
                // NOTE: this now forces header names lowercase since they are    
                // case insensitive and vary by client.    
                if (st.hasMoreTokens()) {    
                    String line = in.readLine();    
                    while (line != null && line.trim().length() > 0) {    
                        int p = line.indexOf(':');    
                        if (p >= 0)    
                            headers.put(line.substring(0, p).trim().toLowerCase(Locale.US), line.substring(p + 1).trim());    
                        line = in.readLine();    
                    }    
                }    
                pre.put("uri", uri);    
            } catch (IOException ioe) {    
                throw new ResponseException(Response.Status.INTERNAL_ERROR, "SERVER INTERNAL ERROR: IOException: " + ioe.getMessage(), ioe);    
            }    
        }    
    
        /**  
         * Decodes the Multipart Body data and put it into Key/Value pairs.  
         * @param boundary  
         * @param fbuf  
         * @param in  
         * @param parms header头里面的参数  
         * @param files  支持多文件上传功能  
         * @throws ResponseException  
         */    
        private void decodeMultipartData(String boundary, ByteBuffer fbuf, BufferedReader in, Map<String, String> parms,    
                                         Map<String, String> files) throws ResponseException {    
            try {    
                //根据boundary获取分割线与内容的间隔位置    
                int[] bpositions = getBoundaryPositions(fbuf, boundary.getBytes());    
                int boundarycount = 2;//源码为1，如果是上传单个文件会有问题    
                String mpline = in.readLine();    
                while (mpline != null) {    
                    if (!mpline.contains(boundary)) {    
                        throw new ResponseException(Response.Status.BAD_REQUEST, "BAD REQUEST: Content type is multipart/form-data but next chunk does not start with boundary. Usage: GET /example/file.html");    
                    }    
                    boundarycount++;    
                    Map<String, String> item = new HashMap<String, String>();    
                    mpline = in.readLine();    
                    while (mpline != null && mpline.trim().length() > 0) {    
                        int p = mpline.indexOf(':');    
                        if (p != -1) {    
                            item.put(mpline.substring(0, p).trim().toLowerCase(Locale.US), mpline.substring(p + 1).trim());    
                        }    
                        mpline = in.readLine();    
                    }    
                    if (mpline != null) {    
                        String contentDisposition = item.get("content-disposition");    
                        if (contentDisposition == null) {    
                            throw new ResponseException(Response.Status.BAD_REQUEST, "BAD REQUEST: Content type is multipart/form-data but no content-disposition info found. Usage: GET /example/file.html");    
                        }    
                        StringTokenizer st = new StringTokenizer(contentDisposition, "; ");    
                        Map<String, String> disposition = new HashMap<String, String>();    
                        while (st.hasMoreTokens()) {    
                            String token = st.nextToken();    
                            int p = token.indexOf('=');    
                            if (p != -1) {    
                                disposition.put(token.substring(0, p).trim().toLowerCase(Locale.US), token.substring(p + 1).trim());    
                            }    
                        }    
                        String pname = disposition.get("name");    
                        pname = pname.substring(1, pname.length() - 1);    
    
                        String value = "";    
                        if (item.get("content-type") == null) {    
                            while (mpline != null && !mpline.contains(boundary)) {    
                                mpline = in.readLine();    
                                if (mpline != null) {    
                                    int d = mpline.indexOf(boundary);    
                                    if (d == -1) {    
                                        value += mpline;    
                                    } else {    
                                        value += mpline.substring(0, d - 2);    
                                    }    
                                }    
                            }    
                        } else {    
                            if (boundarycount > bpositions.length) {    
                                throw new ResponseException(Response.Status.INTERNAL_ERROR, "Error processing request");    
                            }    
                            int offset = stripMultipartHeaders(fbuf, bpositions[boundarycount - 2]);    
                            //创建一个临时文件，然后保存内容，这个函数我们也需要重写setTempFileManagerFactory    
                            String path = saveTmpFile(fbuf, offset, bpositions[boundarycount - 1] - offset - 4);    
                            files.put(pname, path);    
                            value = disposition.get("filename");    
                            value = value.substring(1, value.length() - 1);    
                            do {    
                                mpline = in.readLine();    
                            } while (mpline != null && !mpline.contains(boundary));    
                        }    
                        parms.put(pname, value);    
                    }    
                }    
            } catch (IOException ioe) {    
                throw new ResponseException(Response.Status.INTERNAL_ERROR, "SERVER INTERNAL ERROR: IOException: " + ioe.getMessage(), ioe);    
            }    
        }    
    
        /**  
         * Find byte index separating header from body. It must be the last byte of the first two sequential new lines.  
         * 找到head和body的分界点，两个回车换行  
         */    
        private int findHeaderEnd(final byte[] buf, int rlen) {    
            int splitbyte = 0;    
            while (splitbyte + 3 < rlen) {    
                if (buf[splitbyte] == '\r' && buf[splitbyte + 1] == '\n' && buf[splitbyte + 2] == '\r' && buf[splitbyte + 3] == '\n') {    
                    return splitbyte + 4;    
                }    
                splitbyte++;    
            }    
            return 0;    
        }    
    
        /**  
         * Find the byte positions where multipart boundaries start.  
         * @param b  
         * @param boundary  
         * @return  
         */    
        private int[] getBoundaryPositions(ByteBuffer b, byte[] boundary) {    
            int matchcount = 0;    
            int matchbyte = -1;    
            List<Integer> matchbytes = new ArrayList<Integer>();    
            for (int i = 0; i < b.limit(); i++) {    
                if (b.get(i) == boundary[matchcount]) {    
                    if (matchcount == 0)    
                        matchbyte = i;    
                    matchcount++;    
                    if (matchcount == boundary.length) {    
                        matchbytes.add(matchbyte);    
                        matchcount = 0;    
                        matchbyte = -1;    
                    }    
                } else {    
                    i -= matchcount;    
                    matchcount = 0;    
                    matchbyte = -1;    
                }    
            }    
            int[] ret = new int[matchbytes.size()];    
            for (int i = 0; i < ret.length; i++) {    
                ret[i] = matchbytes.get(i);    
            }    
            return ret;    
        }    
    
        /**  
         * Retrieves the content of a sent file and saves it to a temporary file. The full path to the saved file is returned.  
         */    
        private String saveTmpFile(ByteBuffer b, int offset, int len) {    
            String path = "";    
            if (len > 0) {    
                FileOutputStream fileOutputStream = null;    
                try {    
                    //这个地方的tempFileManager需要我们setTempFileManagerFactory    
                    TempFile tempFile = tempFileManager.createTempFile();    
                    ByteBuffer src = b.duplicate();    
                    fileOutputStream = new FileOutputStream(tempFile.getName());    
                    FileChannel dest = fileOutputStream.getChannel();    
                    src.position(offset).limit(offset + len);    
                    dest.write(src.slice());    
                    path = tempFile.getName();    
                } catch (Exception e) { // Catch exception if any    
                    System.err.println("Error: " + e.getMessage());    
                } finally {    
                    safeClose(fileOutputStream);    
                }    
            }    
            return path;    
        }    
    
        private RandomAccessFile getTmpBucket() {    
            try {    
                TempFile tempFile = tempFileManager.createTempFile();    
                return new RandomAccessFile(tempFile.getName(), "rw");    
            } catch (Exception e) {    
                System.err.println("Error: " + e.getMessage());    
            }    
            return null;    
        }    
    
        /**  
         * It returns the offset separating multipart file headers from the file's data.  
         */    
        private int stripMultipartHeaders(ByteBuffer b, int offset) {    
            int i;    
            for (i = offset; i < b.limit(); i++) {    
                if (b.get(i) == '\r' && b.get(++i) == '\n' && b.get(++i) == '\r' && b.get(++i) == '\n') {    
                    break;    
                }    
            }    
            return i + 1;    
        }    
    
        /**  
         * Decodes parameters in percent-encoded URI-format ( e.g. "name=Jack%20Daniels&pass=Single%20Malt" ) and  
         * adds them to given Map. NOTE: this doesn't support multiple identical keys due to the simplicity of Map.  
         */    
        private void decodeParms(String parms, Map<String, String> p) {    
            if (parms == null) {    
                queryParameterString = "";    
                return;    
            }    
    
            queryParameterString = parms;    
            //使用&来分隔参数    
            StringTokenizer st = new StringTokenizer(parms, "&");    
            while (st.hasMoreTokens()) {    
                String e = st.nextToken();    
                int sep = e.indexOf('=');    
                if (sep >= 0) {    
                    /*  
                     * 这里使用decodePercent来解析，防止参数里面带有中文  
                     * 比如“张杰”那么浏览器会写成%E5%BC%A0%E6%9D%B0  
                     */    
                    p.put(decodePercent(e.substring(0, sep)).trim(),    
                        decodePercent(e.substring(sep + 1)));    
                } else {    
                    p.put(decodePercent(e).trim(), "");    
                }    
            }    
        }    
    
        @Override    
        public final Map<String, String> getParms() {    
            return parms;    
        }    
    
        public String getQueryParameterString() {    
            return queryParameterString;    
        }    
    
        @Override    
        public final Map<String, String> getHeaders() {    
            return headers;    
        }    
    
        @Override    
        public final String getUri() {    
            return uri;    
        }    
    
        @Override    
        public final Method getMethod() {    
            return method;    
        }    
    
        @Override    
        public final InputStream getInputStream() {    
            return inputStream;    
        }    
    
        @Override    
        public CookieHandler getCookies() {    
            return cookies;    
        }    
    }    
    
    public static class Cookie {    
        private String n, v, e;    
    
        public Cookie(String name, String value, String expires) {    
            n = name;    
            v = value;    
            e = expires;    
        }    
    
        public Cookie(String name, String value) {    
            this(name, value, 30);    
        }    
    
        public Cookie(String name, String value, int numDays) {    
            n = name;    
            v = value;    
            e = getHTTPTime(numDays);    
        }    
    
        public String getHTTPHeader() {    
            String fmt = "%s=%s; expires=%s";    
            return String.format(fmt, n, v, e);    
        }    
    
        public static String getHTTPTime(int days) {    
            Calendar calendar = Calendar.getInstance();    
            SimpleDateFormat dateFormat = new SimpleDateFormat("EEE, dd MMM yyyy HH:mm:ss z", Locale.US);    
            dateFormat.setTimeZone(TimeZone.getTimeZone("GMT"));    
            calendar.add(Calendar.DAY_OF_MONTH, days);    
            return dateFormat.format(calendar.getTime());    
        }    
    }    
    
    /**  
     * Provides rudimentary support for cookies.  
     * Doesn't support 'path', 'secure' nor 'httpOnly'.  
     * Feel free to improve it and/or add unsupported features.  
     *  
     * @author LordFokas  
     */    
    public class CookieHandler implements Iterable<String> {    
        private HashMap<String, String> cookies = new HashMap<String, String>();    
        private ArrayList<Cookie> queue = new ArrayList<Cookie>();    
    
        public CookieHandler(Map<String, String> httpHeaders) {    
            String raw = httpHeaders.get("cookie");    
            if (raw != null) {    
                String[] tokens = raw.split(";");    
                for (String token : tokens) {    
                    String[] data = token.trim().split("=");    
                    if (data.length == 2) {    
                        cookies.put(data[0], data[1]);    
                    }    
                }    
            }    
        }    
    
        @Override public Iterator<String> iterator() {    
            return cookies.keySet().iterator();    
        }    
    
        /**  
         * Read a cookie from the HTTP Headers.  
         *  
         * @param name The cookie's name.  
         * @return The cookie's value if it exists, null otherwise.  
         */    
        public String read(String name) {    
            return cookies.get(name);    
        }    
    
        /**  
         * Sets a cookie.  
         *  
         * @param name    The cookie's name.  
         * @param value   The cookie's value.  
         * @param expires How many days until the cookie expires.  
         */    
        public void set(String name, String value, int expires) {    
            queue.add(new Cookie(name, value, Cookie.getHTTPTime(expires)));    
        }    
    
        public void set(Cookie cookie) {    
            queue.add(cookie);    
        }    
    
        /**  
         * Set a cookie with an expiration date from a month ago, effectively deleting it on the client side.  
         *  
         * @param name The cookie name.  
         */    
        public void delete(String name) {    
            set(name, "-delete-", -30);    
        }    
    
        /**  
         * Internally used by the webserver to add all queued cookies into the Response's HTTP Headers.  
         *  
         * @param response The Response object to which headers the queued cookies will be added.  
         */    
        public void unloadQueue(Response response) {    
            for (Cookie cookie : queue) {    
                response.addHeader("Set-Cookie", cookie.getHTTPHeader());    
            }    
        }    
    }    
}   